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- W2018792354 abstract "Abstract A theoretical analysis is given of deuterium 2D exchange spectroscopy using Zeeman‐ and quadrupole‐order experiments in liquid crystalline solutions. For the analysis, a phenomenological vector model for spin I = 1 nuclei under the effect of the quadrupole Hamiltonian and rf pulses is employed, which makes it easy to follow the evolution of the various coherences during the pulse sequences. In both experiments several types of cross‐peaks are obtained; however, only part of them are relevant to the exchange process. It is shown that proper combination of the signals from the Zeeman‐ and quadrupole‐order experiments can lead to 2D exchange spectra with “pure” exchange cross‐peaks as the only off‐diagonal signals. These exchange cross‐peaks can provide estimates for the exchange rates and indicate the relative signs of the quadrupole interactions in the exchanging sites. The method is applied to two compounds which undergo ring inversion, i.e., cyclohex‐ ane‐d 12 and 1,4‐dioxane‐d 8 , dissolved in liquid crystalline solvents. In the Appendices procedures for phase cycling are discussed, and peak intensities for a general two‐site 2D exchange spectrum are derived." @default.
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- W2018792354 date "1988-01-01" @default.
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- W2018792354 title "Two-Dimensional Deuterium NMR Exchange Spectroscopy in Liquid Crystalline Solutions" @default.
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- W2018792354 doi "https://doi.org/10.1002/ijch.198800040" @default.
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